Alice, who works at a major trading company, and her boss, Yuichi, are having an affair. They are attracted to each other and their relationship deepens. However, Yuichi, who has a wife and children, always returns home after their affair. The two have never spent the same night together. It's their first trip to a hot spring... their first night together. Away from their daily lives, at a secluded inn with the scent of hot springs, the man and woman engage in a passionate secret affair.